This is the Debian GNU/Linux prepackaged version of the perl module
Date::Calc renamed to libdate-calc-perl.

ftp://ftp.infodrom.north.de/pub/CPAN/modules/by-module/Date/Date-Calc-4.2.tar.gz

libdatecalc-perl is copyright (c) 1995, 1996, 1997 by Steffen Beyer <sb@sdm.de>.
This is the original copyright notice:

    This package is free software; you can redistribute it
    and/or modify it under the same terms as Perl itself.
